public class Hello {
   public static void main (String agrs[]) {
   System.out.println("dajiahao!");
   System.out.println("Nice to meet you");
   Student stu = new Student();
   stu .speak("We are students");
  }
}
class Student {
   public void speak(String s) {
      System.out.println(s);
  }
} 
